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Oct 19, 2010 - Eight types of human papillomavirus appear to be responsible for over 90 percent of the world's cervical cancer cases; researchers recommend these eight types be the target for future vaccines and that the three most common high-risk human papillomavirus types -- 16, 18, and 45 -- which occur in younger women, should be the focus of type-specific human papillomavirus screening. Their findings have been published online Oct. 18 in The Lancet Oncology.